Study on springback from thermal-mechanical boundary condition imposed to V-bending and L-bending processes coupled with infrared rays local heating

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This paper shows differences of thermal-mechanical boundary condition and springback between V-bending and L-bending processes. Although a recently conducted study showed that an infrared (IR) local heating method substantially reduces springback of dual-phase (DP) 980 steel sheet in V-bending, its application to L-bending, which is one of widely used forming processes in industrial applications, has not been sufficiently reported. In the L-bending experiment conducted in this work, springback does not sufficiently decrease as much as it does in the V-bending test, even though the sheet is deformed under the same temperature condition. For analysis of the difference in springback, thermo-elastic-plastic simulation for both V-bending and L-bending processes were conducted. The numerical analysis shows that the V-bending and L-banding processes have significantly different thermal and mechanical boundary conditions even though both processes go through a bending deformation. The differences in the boundary conditions have a strong effect on the thermal-mechanical behavior of the blank, so that the springback results are different between the two bending processes. Finally, it is also shown that the L-bending process requires a higher temperature condition than the V-bending process in order to sufficiently reduce springback.
Publisher
SPRINGER FRANCE
Issue Date
2018-05
Language
English
Article Type
Article
Keywords

STRENGTH STEEL SHEETS; HOT; WARM; BEHAVIOR

Citation

INTERNATIONAL JOURNAL OF MATERIAL FORMING, v.11, no.3, pp.417 - 433

ISSN
1960-6206
DOI
10.1007/s12289-017-1375-2
URI
http://hdl.handle.net/10203/242426
Appears in Collection
ME-Journal Papers(저널논문)
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